A person who left the building indicated there was concern that a material like anthrax had been received. A United States Postal Service employee was seen exiting the building but it was not known whether she had delivered a potentially suspicious item.

The incident followed Friday's delivery of an envelope that contained a white powdery substance to the Social Security Administration offices at 2 Hawley Street.

Investigators said a note suggested the material was anthrax but tests indicated the material was not hazardous.